/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.core;

import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleEvent;
import org.apache.catalina.LifecycleListener;
import org.apache.catalina.util.StringManager;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;

/**
 * This listener is designed to initialize Jasper before any web applications
 * are started.
 * 
 * @author Remy Maucherat
 * @version $Revision: 491990 $ $Date: 2007-01-03 08:36:57 +0800 (星期三, 03 一月
 *          2007) $
 * @since 4.1
 */

public class JasperListener implements LifecycleListener {

	private static Log log = LogFactory.getLog(JasperListener.class);

	/**
	 * The string manager for this package.
	 */
	protected StringManager sm = StringManager.getManager(Constants.Package);

	// ---------------------------------------------- LifecycleListener Methods

	/**
	 * Primary entry point for startup and shutdown events.
	 * 
	 * @param event
	 *            The event that has occurred
	 */
	public void lifecycleEvent(LifecycleEvent event) {

		if (Lifecycle.INIT_EVENT.equals(event.getType())) {
			try {
				// Set JSP factory
				Class.forName("org.apache.jasper.compiler.JspRuntimeContext",
						true, this.getClass().getClassLoader());
			} catch (Throwable t) {
				// Should not occur, obviously
				log.warn("Couldn't initialize Jasper", t);
			}
			// Another possibility is to do directly:
			// JspFactory.setDefaultFactory(new JspFactoryImpl());
		}

	}

}
